Carbureter.



f R. M. ANDERSON.

GARBI URBTER. APPLICATION FILED JULY 26, 1912.

Patented May 27, 1913.

' fig nzondj fflnderaohy ways 29 and 30. The chamber 28 is also connected with the atmosphere by means of a restricted passageway 31 which is in a plug 32 screwing in the casing. In this way, the plugs may be interchanged for initial adjustment, since the relative sizes of the openings to the atmosphere and to the pressure in the Venturi tube or carbureting by the dot-and-dash line a. .It will be seen carbureting chamber is very important. A fuel tube 33 extends down into the reservoir 25, to a point near the bottom thereof, and extends upwardly so that its end may open into the passa e above the throttle, as illustrated.

The t rottle is shown in its closed position 15.

and it is illustrated as being cut out to accommodate the end of the tube 33.

The operation of my improved device is as follows: When the motor is at rest, the liquid fuel, such as gasolene, may be assumed to be standing at the level indicated that in this condition the fuel has passed through the restricted passageway 27 into the reservoir 25 and has also passed through the restricted opening 21 into the nozzle 19 and the well 22. When the throttle is slightly open and the engine is turned over, air will be drawn past the outlet of the tube 33 at a comparatively high rate of speed and the gasolene will be drawn up through thetube 33 out of the reservoir 25 into the manifold of the engine in practically its raw state. This results in a very rich mixture, desirable for/startin ur oses, and it is clear that the level 05 the el in the reservoir 25 will drop down to the bottom of the.

tube 33. It is to be noted that the surface of the fuel in the reservoir 25 is exposed to.

the pressure in the chamber 28 which, in

turn, is subject to the pressure and the varithis variation, while highly desirable and productive of the best sort of a mixture, is too marked for practical purposes, unless pro erly moderated andI have secured this mo eration by means of the restricted passageway 31 to the atmosphere. The passageway is restricted to such an' extent that it cannot satisfy the suction created in the chamber 28 and it therefore follows that the pressure on the surface of the fuel in the reservoir 25 is lessened, as the engine speed in creases, so that, as before pointed out, the flow through the'passageway 27 is varied accordingly. As the throttle is opened wider, the flow through the. restricted p ssageway 27 is gradually increased and t e flow from the end of the tube 33 is also inplug-having a different size great enough to lift the fuel out of the nozzle and in this way the amount of fuel necessary to complete the proper proportion is secured. When the proper amount of suction is initiated around the nozzle 19, the nozzle and the well are affected and they are gradually emptied. During all this time, however, the fuel is flowing through the restricted passageway 21 at a rate dependin upon the variable head over the nozzle an also upon the variable suction effect of the Venturi tube. If the suction is increased sufliciently, the well and the nozzle 19 are entirely emptied and fuel is drawn throu 'h the restricted passageway 21 by means of t esuction on the nozzle 19 and also by means of the aspiration produced by the rush of air coming in by way of the passa through the well and up through t e nozzle carrying the fuel with it. As the higher engine speedsare still further increased, the aspiration effect upon the nozzle 19 is correspondingly increasedand the flow through the passageway 21 varies accordingly. t will be seen that the flow through the passage'way 21 isaccentuated by reason of the fact that it is below the fuel level maintained in the float chamber. The accentuation of the natural flow through the passageway 21 is, of course, more in proportion to the entire flow at the lower speeds than at the higher speeds since, at the higher speeds, the flow as determined by the vary ing suction'efi'ects on the nozzle is so much greater. In this way, although. the quantity of the fuel and air is increased sufli ciently on'high speeds, the proportion may be changed slightly so that the desirable leaner mixture may speeds.

eway 23,,

be had on the higher It will be clear that the opening 16 at the top of thefioat chamber provides for the constant atmospheric pressure on thef'to'p of the valve in the float chamber. Initial adjustments, for diflerent engines, and under different conditions, are necessarily made in the sizes of the various passageways for air and fuel, the proper relation of areas being always maintained. The tube 27 is removable, upon the removal of the plug 27 and another tube, having a different size opening 27 may bereadily substituted therefor. The plugs 20 may be removed upon the removal of the plug 20 and a different opening 21 may be substituted therefor so as to get the mixture proportions proper for maximum speed.

The plugs may also vary in length, as illus- Letters Patent:

trated in'Figs. 2 and 3, and-plugs of different length may be inserted to, secure various adjustments. It is obvious that the higher the-plug extends the less will be the accentuation due to the natural passage of the flow through the passagewayQl.

I claim as new and-desire to secure by 1. In a carbureter, a carbureting chamber, a fuel jet therein, a constant level supply chamber feeding said fuel jet and exposed to atmospheric pressure, anauxiliary reservoir fed from/said constant level'supply chamber, an auxiliary fuel jet discharging into said carbureting chamber and fed from said auxiliary reservoir, an atmosphere inlet for said auxiliary reservoir, and means for maintaining a sub-atmospheric pressurein a fuel jet therein,

said auxiliary reservoir during operation of said carbureter. I p

2. In a carburetor, a carbureting chamber, a fuel jet therein, a' constant level "supply chamber feeding said fuel jet and'exposed to atmospheric pressure, an auxiliary reservoir fed from said constant level supply chamber, anauxiliary fuel jet discharging into said carbureting chamber and fed from said auxiliary reservoir, an atmosphere inlet for said auxiliary reservoir, and means for maintaining a sub-atmospheric pressure in said auxiliary reservoir during operation of the carbureter" comprising a passage of aironly, communicating with said 'carbureting chamber and with the auxiliary reservoir above the level of the liquid therein.

3. In a carbureter, a carbureting chamber, a constant level supply chamber feeding said fuel jetand exposed to atmospheric pressure,-an auxiliary, reservoir fed from said constant level supplychamber, an auxiliary fuel jet discharging 'into said carbureting chamber and fed from saidauxiliary reservoir, an atmosphere inlet for said auxiliary reservoir, and means for maintaining a variable sub-atmospheric ressure in said auxiliary reservoir dependmg upon the suction of the engine to give a variable supply per unit of time to "said auxiliary fuel et accprding to the suction of the engine,

44 In' a carbureter, a carburetiiig chamber,

I a fuel jet therein, a constqpit level supply chamber feeding said fuel et' and exposed toatmospheric pressure, an auxiliary reservoir fed from said constant level supply chamber, anauxiliary fuel jet discharging into said carbureting chamber and fed from said auxiliary reservoir, a restricted atmos phere inlet for said auxiliary-reservoir, pressure in said auxiliary reservoir uring operation. of the carburetor.

. 5. .Ina carbureter, a carbureting chamber,

air-fuel jet therein, a constant level supply 1,oss,14s

duct for the.

at the bottom of said nozzle,

and means for maintaining a sub-atmos heric the engine.

a restricted atmosphere inlet I auxiliary reservoir upon the '6. In a carbureter, a carbureting chamber, a Venturi tube leading7thereto,a fuel enturi tube, an

nozzle extending into said air inlet forsaid Venturi tube, a constant level supply chamber for liquid fuel, a well at the bottom of said nozzle, a restricted jet connecting said supply chamber and said 7 well, an air inlet for said well, the air entering by said'last-named inlet being adaptedto draw fuel from said jet by suction and to pass with said fuel out of said nozzle, a reservoir, restricted means connecting said supply chamber and said reservoir, means for connecting the chamber over the normal level of the liquid in said reservoir with the interior of the Venturi tube, and a nozzle leading from said reservoir to the carbureting chamber. In a carbureter, a-carbureting' chamber, a Venturi tube'lleadingrthereto, a fuel nozzle extending into said enturi tube, an

air inlet for said Venturi tube, a constant level supply chamber for liquid fuel, a well a removable restricted jet connecting said supply chamber and said well, an air inlet for said well, the air entering by said last-namedinlet being adapted to draw fuel from said jetby suction and to pass with said fuel out of said nozzle, and the height of the jet outlet taking part in determining the flow I therefrom; a reservoir, restricted means.

connecting said supply chamber and said reservoir, means for connecting the chamber over the liquid .in said reservoir with the interior of the Venturi" tube, and a nozzle leading from said reservoir to the carbureting chamber.

8. In a carbureter, ber, a Venturi tube leadin thereto, a fuel nozzle extending into said level su plychamber for liquid fuel, a well at the ottom of said nozzle, a removable restricted jet connecting said supply chamberand said well, an air inlet being adapted to draw fuel from said jet by suction and its an pass with said fuel out of said nozzle, the height of the jet outlet takingv part in a carbureting chamenturi tube, an air inlet for saidVenturi tube, a constant i said reservoir to a determining the flow therefrom, a reservoir, restrictedmeans connecting said supply chamber and said reservoir, means for connecting the chamber over the liquid in said reservoir With the interior of the Vent-uri tube, a throttle, and a nozzle leading from point on the engine side of the throttle.

9. In a carbureter, a carbureting chamber,,a Venturi tube leading thereto, a fuel nozzle extendinginto said Venturi tube, an air inlet for said Venturi tube, a constant level supply chamber for liquid fuel, restricted means for Connecting said supply chamber with said nozzle,

a reservoir in the form of a removable tube, said reservoir having an atmosphere inlet, restrictedmeans connecting said supply chamber and said reservoir, means for connecting the chamber over the liquid in said reservoir With the interior of the Vfenturi tube to maintain sub-atmospheric pressure in said reservoir, and a nozzle leadin from said reservoir to the carbureting chamber. In witness whereof, I hereunto subscribe my name this 24thiday of July, A. D., 1912.

RAYMOND M. MDERSON. Witnesses:

ARTHUR H. Bon'rrongm, ALBIN C. AHLBERG. 

